
/代表根目录;

../代表上一级目录;

../../代表上两级目录;

/..代表下级目录;

/../..代表下两级目录.

同级 直接引用文件名

<img src='katana.jpg'/>

下级 同级目录/下级目录/文件名

<img src='bl9u.katana.jpg'/>


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